Molecular Mechanisms Associated with Drought and Heat Tolerance in Plants and Options for Crop Improvement for Combined Stress Tolerance

Parvathi, M. S.; Dhanyalakshmi, K. H.; Nataraja, K.

doi:10.1007/978-981-15-0025-1_23

Cited by 9 publications

(11 citation statements)

References 148 publications

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“…Heat and drought are major production constraints and are considered as major abiotic stresses that were widely dispersed across the globe 1 , 9 . Screening based on sunflower germplasm was an important step to identify resistant accessions, which may subsequently be used in breeding programs.…”

Section: Discussionmentioning

confidence: 99%

“…Crop species are often exposed to various abiotic stresses, such as extreme temperature, soil salinity, UV light, hypoxia, metal toxicity and drought. Drought and high temperature are the major factors of global climate change 1 . Approximately 75% of the global land area has been affected by water stress and only 13% of the arable area could be cultivatable free of this abiotic stress 2 .…”

Section: Introductionmentioning

confidence: 99%

“…For example, a stress factor can invoke another stress, such as high temperature causing water stress as a result of increasing the evapotranspiration rate 6 , 7 . Moreover, a stress factor can modulate synergistic impacts; for instance, osmotic stress can increase injury in the presence of heat stress 1 . Empirical plant breeding programs address the issue over simplistically as individual abiotic factors 8 .…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, irrigation is used to ameliorate the hydric stress effects, consequently increasing the production cost where water is scarce. Hence, the development of heat and water stress tolerant varieties has been recommended for sustainable yield in sunflower 1 .…”

Section: Introductionmentioning

confidence: 99%

“…can modulate synergistic impacts; for instance, osmotic stress can increase injury in the presence of heat stress 1 . Empirical plant breeding programs address the issue over simplistically as individual abiotic factors 8 .…”

mentioning

confidence: 99%

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Development of a robust hydroponic method for screening of sunflower (Helianthus annuus L.) accessions for tolerance to heat and osmotic stress

Shehzad

Gul

Rauf

et al. 2021

Sci Rep

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Hydroponic systems are known to provide a platform for uniform growth conditions until the reproductive stage. However, many plant species, including sunflower, show poor growth and survivability under conventional hydroponic systems due to poor nutrient availability, hypoxia and algal contamination. Thus, we tested various hydroponic systems to select a hydroponic system suitable for screening of sunflower germplasm. Sunflower accessions showed better growth and leaf gas exchange in newly-designed over conventional hydroponic systems. Selected hydroponic systems were further engaged in sunflower accession screening under heat and osmotic stress in a two-pan system (210 cm × 60 cm). Heat stress treatment was applied by growing sunflower germplasm at 42 °C and osmotic stress by adding polyethylene glycol 8000 which decreased the osmotic potential to − 0.6 MPa. There was significant variability among the sunflower accessions for their ability to survive under stress. Accessions such as C-2721 (43%), C-291 (46%) and D-14 (43%) had lower cell membrane injury percentage under osmotic stress and high seedling survivability (60‒80%) under heat stress when compared with susceptible accessions. Moreover, resistant accessions exhibited greater cuticular waxes and root length but lower transpiration losses. The newly designed hydroponic platform proved reliable for the selection of resistant sunflower accessions. Selected parental lines were validated by assessing their hybrids under field trials across two seasons under water and temperature stress during the reproductive phase (autumn). Hybrid H3 obtained by crossing drought and heat resistant parents had the highest seed yield and water use efficiency.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%